Journal
EXPERIMENTAL PARASITOLOGY
Volume 128, Issue 3, Pages 217-224Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.exppara.2011.03.008
Keywords
Taenia solium; Cysticercosis; Malate dehydrogenase; Metabolism; Recombinant enzyme; Cloning
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Funding
- Universidad Nacional Autonoma de Mexico, DGAPA [PAPIIT-IN200510-3]
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We report herein the complete coding sequence of a Taenia solium cytosolic malate dehydrogenase (TscMDH). The cDNA fragment, identified from the T. solium genome project database, encodes a protein of 332 amino acid residues with an estimated molecular weight of 36517 Da. For recombinant expression, the full length coding sequence was cloned into pET23a. After successful expression and enzyme purification, isoelectrofocusing gel electrophoresis allowed to confirm the calculated pI value at 8.1, as deduced from the amino acid sequence. The recombinant protein (r-TscMDH) showed MDH activity of 409 U/mg in the reduction of oxaloacetate, with neither lactate dehydrogenase activity nor NADPH selectivity. Optimum pH for enzyme activity was 7.6 for oxaloacetate reduction and 9.6 for malate oxidation. K-cat values for oxaloacetate, malate, NAD, and NADH were 665, 47, 385, and 962 s(-1), respectively. Additionally, a partial characterization of TsMDH gene structure after analysis of a 1.56 Kb genomic contig assembly is also reported. (C) 2011 Elsevier Inc. All rights reserved.
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